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Band gap engineered TiO2nanoparticles for visible light induced photoelectrochemical and photocatalytic studies
Abstract
Visible light-active TiO2 (m-TiO2) nanoparticles were obtained by an electron beam treatment of commercial TiO2 (p-TiO2) nanoparticles. The m-TiO2 nanoparticles exhibited a distinct red-shift in the UV-visible absorption spectrum and a much narrower band gap (2.85 eV) due to defects as confirmed by diffuse reflectance spectroscopy (DRS), photoluminescence (PL), X-ray diffraction, Raman spectroscopy, electron paramagnetic resonance, transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and linear scan voltammetry (LSV). The XPS revealed changes in the surface states, composition, Ti4+ to Ti3+ ratio, and oxygen deficiencies in the m-TiO2. The valence band XPS, DRS and PL results were carefully examined to understand the band gap reduction of m-TiO2. The visible light-responsive enhanced photocatalytic activity of m-TiO2 was demonstrated by degrading methylene blue and brilliant blue G. The EIS and LSV in the dark and under visible light irradiation further support the visible light-induced photocatalytic activities of the m-TiO2 due to a decrease in electron transfer resistance and an increase in photocurrent. This study confirms that m-TiO2 can be used effectively as a photocatalyst and photoelectrode material owing to its enhanced visible light-induced photocatalytic activity.
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FUJISHIMA, A., & HONDA, K. (1972) · Nature · doi:10.1038/238037a0 · Cited by 34,169
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Metadata
- Authors
- Khan, M. M., Ansari, S. A., Pradhan, D., Ansari, M. O., Han, D. H., Lee, J., & Cho, M. H.
- Venue
- J. Mater. Chem. A
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2014
- Volume
- 2
- Issue
- 3
- Pages
- 637-644
- ISSN
- 2050-7488 (ISSN-L)
- 2050-7496
- OpenAlex
- W2059936666
- Cited by
- 888
- References
- 1
- FWCI
- 18.51
- Type
- journal article
- Language
- en
- Open access
- closed
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- Khan, M. M., Ansari, S. A., Pradhan, D., Ansari, M. O., Han, D. H., Lee, J., & Cho, M. H. (2014). Band gap engineered TiO2nanoparticles for visible light induced photoelectrochemical and photocatalytic studies. J. Mater. Chem. A. https://doi.org/10.1039/c3ta14052k
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